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A type of half-embedded cone grating nanostructure is proposed for antireflection (AR). It can achieve reflectance of down to 0.5% under normal incidence and 6% under incidence angle as large as 40 degrees in the 300–1100 nm wavelength range. Besides, it can maintain good performance in a large dimension range with a fixed period or vertex angle. Furthermore, the refractive index of the grating can...
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